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Making my own cow sprayer
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<blockquote data-quote="greybeard" data-source="post: 1510359" data-attributes="member: 18945"><p>A starter solenoid for a lawn tractor or Ford 8n tractor should work. Cheap, readily available, and cheap/easy to replace. </p><p>TSC has them for about $12. </p><p></p><p>For that matter, any relay off a 12v car would probably work better with even less current draw, especially the ones that engages the electric radiator fan, A/C compressor or the fuel pump relay.</p><p></p><p>Starter solenoids generally draw 8-10amps for the coil to initially plunge the core down, but require a lot less to hold it down. </p><p></p><p>The other relays I mentioned draw about 1/2 that or less.</p><p></p><p>Easy to wire in. May not be the same for all automotive 12v relays, but for this particular A/C compressor relay, I believe this is how this one would be wired:</p><p><a href="https://postimages.org/" target="_blank"><img src="https://s33.postimg.cc/qp53kyr73/relay.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>"To pump" would be carrying the positive voltage..you would need to independently ground the pump.</p></blockquote><p></p>
[QUOTE="greybeard, post: 1510359, member: 18945"] A starter solenoid for a lawn tractor or Ford 8n tractor should work. Cheap, readily available, and cheap/easy to replace. TSC has them for about $12. For that matter, any relay off a 12v car would probably work better with even less current draw, especially the ones that engages the electric radiator fan, A/C compressor or the fuel pump relay. Starter solenoids generally draw 8-10amps for the coil to initially plunge the core down, but require a lot less to hold it down. The other relays I mentioned draw about 1/2 that or less. Easy to wire in. May not be the same for all automotive 12v relays, but for this particular A/C compressor relay, I believe this is how this one would be wired: [url=https://postimages.org/][img]https://s33.postimg.cc/qp53kyr73/relay.jpg[/img][/url] "To pump" would be carrying the positive voltage..you would need to independently ground the pump. [/QUOTE]
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Making my own cow sprayer
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